Online measurement instrument is the more advanced and commonly used method. Kind of spring-loaded safety valve line instrument measuring devices more. Such as the UK FURMANITE company in the eighties TREVITEST safety valve testing system developed and produced by Crosby portable hydraulic pressure setting means (HSPD) and the like. But it is only after the factory calibration or maintenance scheduled take-off pressure is accurate, mixer maintenance costs, and can not verify the length of time of take-off, take off the pressure back seat height, size and blowdown occurred during operation issues. Therefore, the use of such devices check the accuracy of the safety valve, Shaanxi mixer maintenance, will eventually be verified actual boost. It can be seen, this new type of transmission has increasingly become a medium-sized hydraulic power transmission and power shift transmission contender. For lower operating speed and non-operational state transfer Kongshi speed differences between the special vehicles, using the traditional mechanical transmission for high-speed driving, additional hydraulic drive system for low-speed operation mode can satisfy these two conditions are contradictory requirements. Mechanical - Hydraulic sharing driven approach applied in such vehicles is widespread, this technology has also been applied to aircraft deicing vehicles and field transplanting machine need to "crawl speed" of vehicles and equipment. Truck repair factory, Xi'an Chengtong hydraulic maintenance, repair mixer from Xi'an, Shaanxi Chengtong hydraulic maintenance Limited. Xi'an-hydraulic-repair Ltd. (www.huosu360.com) is Xi'an, industrial maintenance, installation of leaders, over the years, the company implement the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Xi'an Chengtong hydraulic service leadership with the staff warmly welcome all inquiries negotiations to create Xi'an Chengtong hydraulic service better future.